Blowtorch



May 24, 1927. 1|,62`9,9o9

H. L. FISH BLOWTORCH wned Dec. ze, 1`924 lu ucm to@ Patented May 24, 1927.

1,629,9oe PATENT oFFlcE.

HERBERT L. FISH, OF SPRINGFIELD, OHIO, ASSIGNOR TO HARRY C. vDOWNEY, 0F. SPRINGFIELD, OHIO.

nnowmoncn.

This invention relates to improvei'nents in blow torches and it particularly relates to a torch which Ahas a -fuel tank in which the fuel is maintained under pressure to feed the same to the generator and burner.

An object of my invention is to provide an arrangement by which initial air pressure may be applied to the fuel in the'tank and thereafter the pressure automatically maintained by vaporization of the fuel in the tank due to the heat of `-the burner.

A further object of the invention is to provide a torch which is simple and economical in construction and efficient in opera- C tion.

an air pump 3 of any usual Yand suitable" form whereby air may be forced into the tank to provide an initial pressure upon the fuel in a manner common in torches of this character. 'Securely fastened to the upper portion of the tank with van air tight joint is a socket member 4 to receive the reduced lower end of a stem 5. The upper end of the stem is reduced and threaded to receive the threaded bore of a boss 6 of a casting 7. This casting 7 is provided with an inte- Y grally formed'generating chamber 8 to one end of which is connected one end of a tube 9, the other end of the tubebeing connectedv with the threaded nipple 10, projecting l from the tank, by the packing nut 11. A second tube 12, connectedwith the nipple in any suit-able manner so as to communicate i with the tube 9, extends to the extreme bottom of the tank as shown in 'dotted lines A in Fig. 2.

The other end of the generating chamber 8 communicates through a reduced ori-` tice 13 with the vertical portion 14 of ak L-shaped passageway the horizontal portion 15 of which has its outer end closed by a cap 16 and its inner end communicating through a reduced orifice 17 with a burner tube 18,. A. needle valve 19 serves to control thel orifice 13, and the cap 16 allows access to theorilice 17 for cleaning purposes.

The rear portion of the burner tube18 is exteriorly threaded and screwed in an integral extension 20 of the casting 7 and is fitted closely against the forward wall of the passageway 14 in communication with the orifice 17. The rear end of the burner tube l adjacent the orifice 17 forms a mixing chamber and is provided with a series of four openings 21 to admit air, and the central portion of the tube is also provided with a series of air openings 22, six in number in the present case. The rear end of the enlarged forward portion 18 is provided with flame jet openings 23, four in number in the present case. The tube 9 is coiled about theenlarged portion 18 as indicated at 9 with the rear coil in immediate proximity to the openings 23 so as to receive the direct heat of the flames emitted therethrough.

Inserted upon the stemv 5 is a cup member 24 which rests upon a collar 25 placed about the socket member 4; the collar 25, the socket 4 and reduced portion of the stem 5 being secured together by the pin 26.

In operation, vthe pumpv 3 is operated to placey an initial pressure of air upon the fuelin the tank 1, and gasoline or other fuel is placed in the cup member 24 and ignited so as to initially heat the generatingV chamber 8. The valve 19 is then adjusted to admit the proper amount of fuel to the burner tube. The flames emitted from the flame iet openings 23 heat the coils 9 of lthe f uel tube 9, the heat being carried by con- 'ductivity to the tube 12 in the tank 1 which heats the fuel in the tank and vaporizes the same to an extent to place the necessary vpressure upon the fuel to force it through the tube 9, generating chamber 8 and passage 14 to the burner tube. This latter result is accomplished by reason of the fact that the coils 9 of the tube are located in comparatively close proximity to the pipe 12 so that the pipe 12 is kept in a sufficiently hot condition to generate vapor in the tank, and it has been found in practice that thisrarrangement furnishes the required pressure in the fuel tank to uniformly supply fuel to the vburner without the necessity of pumping any additional air into the tank so long' as the torch is kept in continuous operation. While the tubes 9 and 12 inthe present case are .shown separate tubes ,Closed aligned together, yet if desired, these tubes may be made in vone piece. In the present case the tube l2 forms in effect an extension of the tube 9 and receives the heat conducted by the same.

Having thus described my invention'7 I claim: V

In a blow torch, a tank, a generator and a burner tube, means for supporti-np; sameby i and immediately above the tank and in close proximity theretofa fuel tube independent of said supporting means ycoiled about said Vburner tube immediately above said tank,

one end of said fuel tube being connected `with said generator and the other end of said fuel tube extended immediately ldownward from said coil and projecting into said tank in proximity to the lower' portion of the 'interior thereof, said burner tube being `,provided With flame jet openings in proximity to said coil to heat said coil and cause the heat to be conducted by said tubeI to the fuel in said tank, said fuel tube forming the sole means of conducting,- heat yto said fuel.

HERBERT L. FISH. 

